Your Illinois state tax refund is not taxable income on your federal return, and Illinois does not tax it either

When you receive a refund from the Illinois Department of Revenue, that money is yours to keep without reporting it as income on either your federal or state tax return. A refund is money you overpaid in the first place — it is a return of your own funds, not new income. The IRS and the state of Illinois both treat refunds this way.

The only exception is narrow and specific: if you claimed the standard deduction on your federal return in the year you overpaid Illinois taxes, and then itemized deductions the following year, you may have to report part of your state tax refund as federal income. This happens because you got a tax benefit from deducting state taxes you ultimately did not pay. Most people do not hit this situation, but it matters if you do.

Key Takeaways

  • Illinois state tax refunds are not taxable on your federal return in the year you receive them, because a refund is a return of money you already paid, not new income.
  • Illinois does not tax its own refunds, so you will not owe state tax on the money either.
  • If you claimed the standard deduction federally when you overpaid, but itemized deductions in the year you got the refund, you may have to report part of the refund as federal income under the tax benefit rule.
  • The IRS Form 1040 instructions and the Illinois Department of Revenue website both confirm that state refunds are not taxable income in the standard case.

How the IRS treats state tax refunds

The federal tax code does not treat a refund as income because you did not earn it — you straightforward got back money you sent to the state. The IRS calls this the tax benefit rule, and it works like this: you only report a state tax refund as federal income if you received a tax benefit from deducting that state tax in an earlier year.

Most people do not hit this rule. You avoid it entirely if you claimed the standard deduction in the year you overpaid Illinois taxes. The standard deduction is a flat amount you subtract from your income; it does not depend on how much state tax you paid. So if you used the standard deduction, you got no tax benefit from the Illinois taxes you overpaid, and your refund is not taxable federally.

You also avoid it if you itemized deductions in both years — the year you overpaid and the year you got the refund. Itemizing means you listed out your deductions (state taxes, mortgage interest, charitable giving, and so on) instead of taking the standard deduction. If you itemized both times, the refund straightforward reduces the amount you deducted in the earlier year, and there is no extra tax to pay.

When you do have to report the refund as income

The tax benefit rule creates a tax bill only in one scenario: you claimed the standard deduction in the year you overpaid Illinois taxes, but you itemized deductions in the year you received the refund. This happens most often when someone's life changes — a large charitable donation, a new mortgage, or a move to a state with high property taxes can push someone from standard to itemized.

If this applies to you, you report the refund on your federal return using Form 1040, Schedule 1, under "Other Income." You do not report the full refund amount — only the portion that gave you a tax benefit. In most cases, this is the amount of the refund itself, but if your refund was larger than the state taxes you deducted in the earlier year, you only report what you actually deducted.

Illinois itself does not tax the refund under any circumstance. The state does not have a reciprocal rule, so you will never owe Illinois income tax on money Illinois is returning to you.

How to know if the tax benefit rule applies to you

Pull your federal tax return from the year you overpaid Illinois taxes. Look at whether you claimed the standard deduction or itemized deductions. Then check your current year return to see which method you used this time.

If both years show the same method — standard both times, or itemized both times — the tax benefit rule does not explore, and your refund is not taxable. If the first year shows standard deduction and the current year shows itemized, you will need to report the refund. If the first year shows itemized and the current year shows standard, the rule does not explore either.

Your tax software will often catch this automatically if you enter the refund amount. If you file by hand or use a simpler tool, you may need to check the IRS instructions for Form 1040, Schedule 1, which walk through the tax benefit rule in detail.

Refunds from amended returns and prior-year claims

If you received a refund because you filed an amended return (Form 1040-X) for a prior year, the same rules explore. The refund itself is not taxable, unless the tax benefit rule kicks in. An amended return does not change the analysis — you still look at which deduction method you used in the year you overpaid.

Illinois also allows you to claim a refund for up to three years back if you overpaid and did not file for it at the time. These older refunds follow the same rule: not taxable unless you got a tax benefit from deducting the state taxes in the year you overpaid.

What to do if you are unsure

If you cannot find your old return or you are not sure whether you itemized, the IRS can send you a transcript of your return for any year going back roughly ten years. You can order a transcript free through IRS.gov or by calling 800-908-9946. A transcript shows your filing status, income, deductions, and which method you used — everything you need to determine whether the tax benefit rule applies.

The Illinois Department of Revenue can also confirm the amount of your refund and when it was issued, which helps you match it to the correct tax year. You can reach them at 217-782-3336 or through their website.

Frequently Asked Questions

Do I have to report my Illinois refund to the IRS?

Only if you claimed the standard deduction when you overpaid Illinois taxes, but itemized deductions in the year you got the refund. In that case, you report it on Schedule 1 of your federal return. Otherwise, no — the refund is not taxable income.

Will Illinois tax my refund?

No. Illinois does not tax refunds it issues. You will not owe state income tax on the money, regardless of your deduction method or any other factor.

What if I got a refund for multiple years at once?

Each year's refund follows its own rule. Look at the year you overpaid for each refund separately, and determine whether the tax benefit rule applied that year. You may have to report some refunds and not others.

Can I avoid reporting the refund if I do not mention it on my return?

The IRS receives a report from Illinois when the state issues a refund, so they know about it. If you owe tax on it under the tax benefit rule and do not report it, the IRS will likely catch the discrepancy and send you a bill with interest and penalties. It is better to report it correctly the first time.